Hello,
is there a way to use the aggregate function to calculate monthly mean
in case i have one row in data frame that holds the date like
-mm-dd? i know that it works for daily means. i also like to do it
for monthly and yearly means. maybe there is something like aggregate(x,
$Date - as.Date(DF$Date)
aggregate(DF[z], list(yearmon = format(DF$Date, %Y-%m)), mean)
On 4/23/07, Michel Schnitz [EMAIL PROTECTED] wrote:
Hello,
is there a way to use the aggregate function to calculate monthly mean
in case i have one row in data frame that holds the date like
